Strain yoke for electrical conductors



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Patented May 5, 1936 UNITED STRAIN; YQKE .FOR. ELECTRICAL Qonnwrons John J. Taylor, Barberton, Ohio, assignor to The Ohio Brass Company, Mansfield Ohio. a cor- This invention relates to a cross yoke for a strain member by means of which 'a. pairof in sulator strings may be connectedto an electrical conductor or to, a supporting. structure. The. yokes are usuallyused in pairs, the ends of the yokes being connected by insulator strings and the central portion of. the yoke beingconnected to the transmission line and the SllPPQItillg.StiZ ll-. ture respectively.

One object of the invention is to provide a close coupled yokeso as to reduce the effect of vibration and also to conserve space.

Another object of the invention is to provide a strong and mechanically efiicient. device which shall be economicalto'manufacture and easy to install.

A further object of the invention is to provide a device of the class named which shall be of improved construction and operation.

Other objects and advantages will appear from the following description.

The invention is exemplified by the combination and arrangement of parts shown in the accompanying drawing and described in the following specification, and it is more particularly pointed out in the appended claims.

In the drawing:

Fig. 1 is a plan view showing one embodiment of the present invention.

Fig. 2 is an elevation of the device shown in Fig. 1.

Fig. 3 is an end view of the device shown in Figs. 1 and 2.

Fig. 4 is a central transverse section of a modified form of the invention.

As shown in the drawing, the strain yoke is made up of a pair of complementary bars l0 and II which are held together in spaced relation by connecting bolts I2; the bars may be spaced apart by any suitable means such as webs l3 and bosses M. The yoke is provided with a central pivot pin 15 for attachment to the supporting structure or to the strain clamp for holding the conductor. End pivots l6 and I! are also provided for attachment to the insulator strings. It is desirable that the pivotal axes l5, l6 and ll be as nearly in a common plane as practical in order to prevent vibration of the yoke about an axis extending longitudinally of the yoke. If the pivots l5, l6 and H were arranged in a triangle having a considerable altitude, there would be danger that vibration of the conductor would set up vibration of the yoke about an axis transverse to the conductor and extending in the plane of the triangle formed by the pivots l5, l6 and I1 andsomewhere between the baseand the apex of h tr l h dan e s a id by ee ing h -axe of fi lerivots m ear a qmmonn ane as possible. In order to do; this, the sidebars or plates I 0 and l;l are spaced apartto-for-m the ke d. transversely reite a ed a a o nt an.- ox m te m d t en he r deee o re.- ceiving ri e v 15- A haped ba o clevis l8 engagesthe pivot pin t5 and-is provided with a transverse pivotpin [.9 for attachment to; 10".

the i ppqrtqr 9 the condu tor- This. dqu l pivot arrangement provides a universal joint etw n he oke a d.fl Qn uC r 0 support sothat theconductorfree to assumeanyamw ill r n iti n. t. m y. end: o. t elative to.

the q i his. redu es. therm s o v br t on, and also prevents undue stress in the yoke in case one of the insulator strings connected to the pivots l6 and I! should break.

A closer coupling and a somewhat more nearly 20 universal pivotal arrangement is secured by the modified form of central pivot member shown in Fig. 4. In this modification, a central pivot block 20 is provided having laterally extending pintles 2| for engaging the openings in the side bars I0 25 and II of the yoke. The block 20 has a central rectangular recess for receiving the end of a link or other attachment member by means of which the yoke is connected to the supporting structure or to the strain clamp for the conductor. 30 The sides of the block are perforated at 22 for receiving the pivot pin I9 but in this case, it will be noted that the axis of the pivot pin I9 is in the same plane as the axis of the pintles 2|, that is, the axis of the pin l9 and the pintles 21 35 intersect each other.

The side bars I0 and. II are preferably bent inwardly at their ends to engage each other and thus form additional spacing abutments for holding the bars in spaced relation to each other. 0 The abutting ends of the bars may be extended, as shown at 23 and 24, and provided with holes 25 for the attachment of arcing members. The extensions 23 and 24 are not, however, an essential feature of the invention.

It will be seen that the invention provides a strong, closely coupled yoke and one having a pivotal connection at the center of the yoke for the supporting structure or conductor which permits substantially universal pivotal movement to 50 reduce the eifect of vibration.

I claim:

1. A strain yoke comprising spaced side members having aligned transverse openings therein at the middle of said yoke, means for connect- 55 ing said members together, side by side but spaced apart at their middle, connecting means at the opposite ends of said yoke, and pivotal connecting means at the middle of said yoke for holding a connected member thereto, said pivotal connecting means comprising a pivot block and oppositely directed trunnion portions extending into the aligned openings in said side members and pivotally securing said block between said plates, said block having a pivotal opening therethrough transverse to the axis of said trunnion portions and in position to receive a pivot pin disposed between said side members with its axis extending longitudinally of said yoke, said block, pivot pin and trunnion portions providing for pivotal movement between said yoke and connect'ed member about an axis transverse to said yoke and also about an axis extending longitudinally of said yoke.

2. A strain yoke comprising a lever arm, connections at the opposite ends of said arm and a central connection comprising a block having pivotal connection with said arm and having a pivot for connecting a strain member to said arm, the axis of the pivotal connection of said block with said arm and the axis of the pivot for connecting a strain member to said arm intersecting each other, the common plane of said intersecting axes lying between opposite longitudinally extending boundary edges of said lever arm.

3. A strain yoke comprising a lever arm having sides spaced apart at their middle portion, means for connecting strain members to the ends of said yoke respectively, and a pivot block interposed between said sides at the middle of said yoke, said pivot block having pintles thereon engaging openings in the sides of said yoke and having a perforation therethrough transverse to the axis of said pintles for receiving a pivot pin for connection to a central strain member.

4. A strain yoke for an electrical transmission line comprising a pair of plates having portions thereof spaced apart and arranged side by side, pivot pins disposed transversely of said plates at the opposite ends of said yoke for supporting insulator strings to be connected to said pivot pins respectively, a pivot block disposed between said plates at the center of said yoke and having pintles thereon pivotally connected with said plates, said block having a recess therein for receiving a connecter and a pivot pin for said connecter extending through said block and adapted to extend through said connecter transversely of said pintles and having its axis intersecting the axis of said pintles.

5. A yoke for supporting an electrical conductor comprising a pair of plates disposed side by side but spaced apart at their middle, means for securing said plates in spaced relation to form a yoke, pivot pins disposed transversely of said plates at the opposite ends of said yoke for connection to insulator strings, a pivot block disposed between said plates at the middle of said yoke, said pivot block having pintles thereon journalled in said plates, said block having a re cess therein for receiving a strain member, and a pivot pin for securing said strain member to said block, said pivot pin having its axis transverse to the axis of said pintles and substantially intersecting the axis of said pintles.

JOHN J. TAYLOR. 

